Auger-bit.



No. 781,652. PATBNTED FEB. 7, 1905.

c. 0. HIATT.

AUGER BIT.

APPLICATION FILED APR. 6, 1904.

Witnesses:

V H I Httornegs,

In e ntor,

UNTTED STATES Patented February '7, 1905.

PATENT FFicE.

AUGER-BIT.

SPECIFICATION forming part of Letters Patent No. 781,652, dated February '7, 1905.

Application filed April 6, 1904. Serial No. 201,935. I

To al 1117101, it 71mg concern.-

Be it known that l, CHARLns CIIRIs'rorI-IER HIA'r'r, a citizen of the United States, residing at Wilmington, in the county of Clinton and State of Ohio, have invented anew and useful Auger-Bit, of which the following is a specilication.

This invention relates generally to angerhits. and particularly to that class known as central-stem double-cutter auger-bits.

The object of the invention is to improve the screw of the bit in such a manner as to reduce the power necessary to enter it in the work and to render it possible to keep the point sharp and thus thoroughly effective at all times for accomplishing the purposes designed.

With the above and other objects in View, as will appear as the nature of the invention is better understood, the same consists, generally stated, in an auger-bit having a screw the end of which terminates in a cone-shaped or angle drill-point.

The invention consists, further, in an augerbit having a screw provided with double threads the ends of which terminate in oppositely-disposed cutting edges presenting a conical point.

The invention consists, further, in a centralstem double-cutter auger-bit having a screw the end of which terminates in a conical double cuttingpoint.

The invention consists, finally, in the various novel details of construction of an auger-bit to be hereinafterfully described and claimed.

In the accompanying drawings, forming a part of this specification, and in which like characters of reference indicate corresponding parts, there are illustrated two forms of embodiment of the invention, each capable of carrying the same into practical operation, it being understood that the elements therein exhibited may be varied or changed as to shape, proportion, and exact manner of assemblage without departing from the spirit thereof.

in the drawings, Figure 1 is a view in elevation, of a central-stem double-cutter augerbit provided with a double-threrulcd screw having its point made cone-shaped. Fig. 2 is an enlarged detail view of the screw shown in Fig. 1. Fig. 3 is an end view of the screw shown in Fig. 2. Fig. 4 is an enlarged detail view of a single-threaded screw. Fig. is an end view of the screw shown in Fig. 4.

Referring to the drawings, 1 designates an ordinary central-stem auger-bit having a single convolute blade 2, a pair of cutters 3, and a scres 4:. As the stem and cutters are of the construction common to such bits, further description is deemed unnecessary.

The present invention resides in the improvement in the point of a screw by which its rapid entrance into hard wood may be readily effected with a minimum of labor and which permits of the point being sharpened when it has become blunt. In Figs. 1 and 2 the screw is of the ordinary double-thread type, and the ends of the threads are pitched at opposite angles to each other to form a cone-shaped terminal 5, the edges of the terminal being sharpened to present chisel cutting-surfaces 6. In the form of embodiment of the invention shown in Fig. the screw is of the single-thread type and the terminal of its thread is formed into a half-cone, the inner wall of which is disposed approximately in alinement with the long diameter of the stem. The pitch of the screw-threads are to be determined by the work to be donethat is to say, whether rapid or slow boring is to be effected or whether heavy or light cutting is to be secured. By the provision of the peculiar-shaped point of the screw less resistance is presented to its entering into the wood, and, as before stated, the point may readily be sharpened when it has become blunt.

Having thus fully described my invention, what I claim is- 1. An auger-bit provided with a screw-point having a cone-shaped core and two flanges carried around it and constituting cuttingthreads, the cutting ends of the flanges being trimmed back from the point of the cone toward their outer cutting edges.

my own I have hereto afliXed my signature in the presence of tWo Witnesses.

CHARLES. CHRISTOPHER HIATT WVitnesses:

CLARA PALMER, A. M. SANDERSON. 

